Tobruk, is the style of bunker as well as the port in North Africa, this style of bunker was first encountered by the allies at Tobruk , but was used by both German and Italian armies in static defense lines everywhere including all the static lines in France and Italy, so the diorama could be North Africa, or Normandy, or the Gothic line etc.

Thanks for your kind comments gents, And the explenations too. Indeed, most of the time, it was the best place to be for the German soldier. Untill Rommel arrived in Normandy, there was little to no defence in Normandy, and the troops had very little to do there.